Min. [ad. Ger. johannit; so named by Haidinger, 1830, in honor of the Archduke Johann: see -ITE.] Uranium sulphate containing some copper, found in green druses.
1835. Shepard, Min., I. 288. Johannite … dissolves easily in water.
1892. Dana, Min., 978. Johannite…. In a glass tube at a low heat does not change.
